Throwing warning for deprecated disable_window_seconds

[giacomodabisias]

Currently the disable_window function

luigi/luigi/task.py

Line 216 in 92fe69e

def disable_window(self):

returns a reference to disable_window_seconds

luigi/luigi/task.py

Line 224 in 92fe69e

def disable_window_seconds(self):

This function throws a warning which states that disable_window_seconds is deprecated stating that disable_window should be used.

This does not make much sense and causes errors when you treat warnings as errors :)
Could we either remove the warning or actually implement the disable_window properly?